2. MOOCs
Certification on
Wind Energy
◦ During this course, they gave me a tour of
different wind energy disciplines guided by
topical experts from DTU’s Department of Wind
Energy. Along the way, they also showed me the
opportunity to work hands-on in real field with
some fundamental wind engineering problems.
◦ In this course I learnt about why is wind energy
important? How is a wind energy project
planned? And what are the environmental
concerns? In this wind resources module, I also
learnt how the wind varies in time and space, and
how to apply basic engineering models for wind
speed and determine the annual wind energy
production for a wind turbine.
3. Introduction
to the wind
energy
◦ Wind Energy/power is the power
obtained by harnessing the energy of
the wind.
◦ Wind power is
a sustainable, renewable
energy source that has a much
smaller impact on the
environment compared to
burning fossil fuels.
◦ To generate wind energy we need a
machine called windmill.
4. Need of wind
energy in the
energy
system
◦ Climate change
◦ Environmental concern
◦ Security of energy supply
◦ Cost competitiveness
◦ Employment
◦ Fast installation
5. History of
wind usage
◦ One of the earliest energy resources.
◦ The first windmill was manufactured in
the United States, designed by Daniel
Halladay(7th century).
◦ Windmills were introduced to Europe by
the crusaders around 1300 A.D.
◦ Development of wind in India began form
the year 1952
◦ Earlier it was only used for pumping water
and harvesting
◦ Ancient Chinese used vertical axis
windmills to grind grain and pump water.
7. How does
wind gets
converted
into energy
??
◦ Wind turbines convert the kinetic energy in the
wind into mechanical power. This mechanical
power can be used for specific tasks (such as
grinding grain or pumping water) or a
generator can convert this mechanical power
into electricity.
◦ A wind turbine works the opposite of a fan.
Instead of using electricity to make wind, like a
fan, wind turbines use wind to make electricity.
The wind turns the blade, which spin a shaft,
which connects to a generator and makes
electricity
◦ The energy in the wind turns two or three
propeller- like blades around a rotor. The rotor
is connected to main shaft, which spins a
generator to create electricity. Wind turbines
are mounted on a tower to capture the most
energy
8. Typical power
curve for a wind
turbine.
◦ Cut-in speed Is the min
speed require to run
the rotor blades.
Generally 3m/s
◦ Cut-out speed is the
max speed which the
turbine can handle,
after this the turbine
automatically cut them
off as a precaution.
Generally 25m/s
11. Environmental
Impact Assessment
(EIA) Process
◦ Preparing an environmental document is a
required process for most of wind siting
decision
◦ Purpose is to evaluating potential benefits
and risks and invoke stakeholders and
publics
◦ Social, economical and environmental
effects
◦ Covers all phases of the project (planning,
construction, operation, decommissioning)
12. Some basic factors affecting
windmill’s location
Air density(high
high)
Rotor blade radius
(high high)
Visual and noise
influence
Nearest building
and roads
High productivity land
14. Height factor of windmill
Wind velocities increase at
higher altitudes due to
surface aerodynamic drag
(by land or water surfaces)
and the viscosity of the air.
Doubling the altitude of a
turbine, then, increases the
expected wind speeds by
10% and the expected
power by 34%.
Doubling the tower height
generally requires
doubling the diameter of
the tower as well (
increasing the amount of
material by a factor of at
least four )
5,000 MW to 7,700 MW
per year by going from 80
to 125-meter tower height.
15. Siting of wind
turbine on land
◦ Distance to house and roads
◦ Wind variation chart
◦ Environmental impact on flora and fauna
◦ Grid connection
◦ Local acceptability
16. Siting of wind
turbine offshore
◦ Distance of land and harbour
◦ Water depth and sea bed properties
◦ Navigation routes
◦ Grid connection through subsea cable
◦ Wind flow chart
◦ Environmental impact on marine mammals
18. Horizontal
and Vertical
Windmill
o Horizontal windmills –
Mostly used for domestic
and at low scale type of
windmills in which the rotor is
placed horizontally. It was
discovered that this type of
windmill was oldest one.
o Vertical windmills – Most
popular type of windmill in
current era, it’s widely used
when windmills stopped
being used only for grinding
grains or moving water and
were used for much wider
array of industrial jobs (even
cutting wood).
19. Basic types
of Windmill
◦ Horizontal Axis
◦ Vertical Axis
S
No.
Horizontal Axis Wind
Turbine
Vertical Axis Wind Turbine
1. In HAWTs, the axis of
rotation of the rotor is
Horizontal to the ground.
In VAWTs the axis of rotation
of the rotor is perpendicular to
the ground.
2. Yaw mechanism is present. Absence of Yaw mechanism.
3. It has high initial installation
cost.
It has low initial installation
cost.
4. They are big in size. They are small in size.
5. Its efficiency is high. It has low efficiency.
6. It requires large ground area
for installation.
It requires less ground area for
installation.
7. High maintenance cost. Low maintenance cost as
compared with HAWT.
8. They are self-starting. They are not self-starting.
9. They are unable to work in
low wind speed condition.
They are capable of working in
low wind speed condition.
10. Difficult in transportation. Easy in transportation.
11. They are mostly used
commercially.
They are mostly used for
private purpose only.
12. It cannot be installed near
human population.
It can be installed near human
population.
13. It is not good for the bird’s
population.
It is good for the bird’s
population.
21. Advantages of Wind Energy
GREEN ENERGY LOW MAINTENANCE
COST
EMPLOYMENT IN
LARGE SCALE
COMMERCIAL +
DOMESTIC USES
LONG TERM
INVESTMENT
COST OF PER UNIT
ELECTRICITY IS LOW
22. Disadvantages of Wind Energy
REMOTE LOCATIONS NOT THE MOST
EFFECTIVE AND
PROFITABLE USE OF
LAND
IMPACT ON LOCAL
WILDLIFE
FLUCTUATING WIND
SPEED
VISUAL AND NOISE
POLLUTION
23. SOME OF THE LARGEST WIND
ENERGY CONSUMING COUNTRY IN
THE WORLD
24. 1 .
China
( installed capacity
236GW )
China is the world leader
in wind energy, with over
a third of the world’s
capacity.
Jiuquan Wind Power Base,
China is the world’s biggest
wind farm, with a planned
installed capacity of 20GW.
25. 2.
US
( installed capacity
105GW )
Alta Wind Energy Centre,
California the Alta Wind
Energy Centre is the
biggest wind farm in the
US. With a combined
installed capacity of
about 1.55GW.
26. 3.
Germany
( Installed capacity 59.3
GW)
More than 26,772 wind
turbines were located in
the German federal area
Germany also has a
number of turbine
manufacturers,
like Enercon, Nordex and
Senvion.
27. Top 5 countries by cumulative
wind capacity
36%
16%10%
6%
4%
28%
2019
China United State Germany India Spain Others
29. Natural resource usage in India
24%
18%
16%
10%
32%
2019
Soalar Wind Biomass Geothermal Hydroelectric
30. Conclusion
Good source for
low-cost electricity
Under Developing
phase
Developing
industry
Bright industry
future
Bright job career Need to overcome
the disadvantages
31. Certificate
Certificate of completion
of my course on Wind
Energy. Duration of 5
weeks from 2nd sept to
29th oct.
Certificate is authorized
by technical University of
Denmark(DTU) and
offered through
Coursera platform
